Transom-lifter



(No Model.) 2 Sheets-Sheet 1 G W. HAMILTON.

TRANSOM LIFTER.

No. 446,865. Patented Feb. 24,1891.

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(No Model.) Y 2 Sheets-Sheet 2.

G. W. HAMILTON.

TRANSOM LIFTER.

No. 446,865. Patented'Feb. 24, 1891.

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UNITED STATES PATENT OFFICE GEORGE XV. HAMILTON, OF BOSTON, MASSACHUSETTS.

TRANSOM-LIFTER.

SPECIFICATION forming part of Letters Patent No. 446,865, datedFebruary 24, 1891. Application filed November 10, 1890- Serial No. 370,926. (No model.)

To all whom it may concern..-

Be it known that I, GEORGE W. HAMILTON, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Skylight Lifters and Fasteners, of which the following is a specification, reference being had tothe accompanying drawings, which form a part hereof.

The object of my invention is a device for opening and closing a skylight or any hinged or sliding sash, havingin combination a safety locking arrangement so constructed that if the lifting-bar becomes in any way released from its locked position the sash can fall only a limited distance before it will look again.

My invention consists of alifting-bar hinged at one end in such a manner as to allow the bar to be canted or partially turned on edge against spring-pressure, the lifting-bar having a series of notches or openings and passing through a locking-plate having a slot which forms a guide, in which the lifting-bar when canted slides until one of the notches or openings in the bar comes in line with a stop on the plate, when the bar yields to the spring-pressure, which thrusts the notch into engagement with the stop.

In the drawings, Figure 1 is an inside view, partly in section, showing a sash and frame with the sash open and the bar fastened. Fig. 2 is an inside view showing the liftingbar in a sliding position between two notches. Fig. 3 is a perspective view of the lockingplate detached. Fig. 4 is a perspective of the spring-pintle and journal-plate detached. Fig. 5 is a vertical section. Fig. 6 shows a modified form of lifting-rod with holes instead of notches. Fig. 7 shows the modified form of locking-plate used with the liftingrod of Fig. 6.

B represents a sash of a skylight or a scuttle and is hinged to the frame A. The liftingbar D is hinged on the spring-pintle E. This pintle is a spring-wire passing through an elongated guide-slot f in the ear f, and is secured at each end, one end being journaled in the ear of the plate F and the other end being shown as secured by a staple f The lifting-bar D has a series of notches d in its edge and passes through a slot in the lockin g-plate G. This slot has one branch g parallel with the plane of the lifting-bar when the lifting-bar is in its locked position and not pressing against the spring. The branch g is of a length sufficient to receive the lifting-bar when against a notch, but not long enough to receive the full width of the bar. A branch g extends obliquely to the branch g, and is of sufficient length to leceive the full width of the bar D. hen the bar is in the position shown in Fig. 1, the shoulder 9 formed by the two branches 9 g of the slot, engages with one of the notches d, and thus securely fastens the bar against sliding movement. hen desired to slide the bar up or down to further open or close the sash or scuttle, the bar D is given a slight twist or rocked upon one side with the hand to bring it in plane with the oblique branch g of the slot, as shown in Fig. 2, thus lifting the notch d out of engagement with the shoulder g and allowingv it to slide in the branch 9 as a guide. The elongated slot f allows a slight bending of the spring-pintle E to correspond with the turning of the lifting-rod. The pressure of the spring tends to force the lifting-rod back into the same plane it originally occupied, and thus causes it to bear snugly against the shoulder g during its sliding movement between the notches d. As soon as the next notch comes opposite the shoulder 9 this spring-pressure forces the bar D to fall back into the slot g, with the shoulder g in the next notch, securely fastening the bar against further sliding until raised out of engagement, as before. Thus if the bar should accidentally escape from one notch, or if while raising or lowering the scuttle the lifting-bar should slip from the grasp, the

scuttle could not fall clear down, but would be stopped as soon as the next notch came against the shoulder g In the modification shown in Figs. 6 and 7 small holes (1 near one edge of the bar are substituted for the notches d, and the form of the slot is changed so as to leave a tooth g, which enters the holes 01, to lock the bar in like manner as the shoulder 9 engaged with the notches (Z.

The spring-pressure on the lifting-bar may be obtained in various ways, the main object being to have the bar capable of canting to one side against spring-pressure and allowed to slide in guideways until one of the open ings in the bar comes in line with the stop and allows the spring to thrust the bar back to its normal plane, the stop engaging with the notch to securely fasten the bar until lifted out of engagement.

My invention is adapted for use with a skylight or scuttle or any cover or sash which is opened by a lifting-bar. It is specially adapted for use in green houses, Whether the sash is hinged or slides in oblique guideways.

What I claim as my invention is- 1. In a skylight and scuttle lifter and fastener, a lifting-bar hinged at one end in such a manner as to allow the bar to partially turn on edge against spring-pressure, the free end of the bar passing through a locking-plate having a slot, which forms a guide in which the lifting-bar slides when partially turned against the pressure of the spring, the bar having a series of openings, which are forced by the spring into engagement with a stop on the locking-plate when the sliding of the bar brings one of the openings in line with the stop and the bar is allowed to yield to the spring-pressure, substantially as described.

2. In a skylight or scuttle litter" and fastener, the combination of a lifting-bar pivoted at one end to a spring-pintle, the pintle passing through a guide-slot, which allows a lateral movement of the pintle intermediate of the ends, the free end of the lifting-bar passing through a slotted locking-plate attached to the frame, the slot being of such form as to allow the lifting-bar to slide when given a slight turn or rocking movement on one side against the pressure of the spring-pintle, the lifting-bar having a series of notches or holes, and the locking-plate having a catch with which the holes or notches of the lifting-bar are forced to engage by the pressure of the spring when the sliding of the bar brings one of the holes or notches against the catch, substantially as described.

GEORGE W. HAMILTON. Witnesses:

DAVID M. LADD, WM. A. COPELAND. 

